Strange Message

I tried to leave a comment on a blog, and I was taken to a page telling me that I wasn't logged in on the proper email address (I was). I was shown what my comment would look like once I had reentered my password. I tried several times to go back and comment, and I got the same message. I finally logged out and logged back in. Any idea what happened here?

I could "like" the post, I could navigate to my own reader and had all the other privileges of being logged in, and I could comment on other blogs. Weird issue with my ancient laptop, or something else entirely?